#electronics #log #?
i bought a second hand semi-ded UPS for dirt cheap, replaced battery and MCU filter caps, and it was great
worked like that for 5 years or so
then it was away from me for half a year in unknown condition and then transported to me
it came with dead battery
bought a new battery, plugged it in, seemed good
incidentally unplugged the battery when it was plugged in a working (but not loaded) UPS, and something exploded inside with a nice bang and flash
have no clue why
disassembly shown a fried MOSFET
not sure if it makes any sense to try to fix it
but sadly .me is not Moscow, so can't buy loads of used UPSes for dirt cheap
the fried one is at the right: https://tinystash.undef.im/il/4Z7EYDuSqDh47tQcw4qGjUuJv9VNfVCr24nGmvB8zZ7kdZo1ZnNtfPxyAps7zXFeg5JJvp5rj8W6zNSBAwc2Epvz.jpg
no idea what it feeds, so no clue why opening it would cause a short
also some sus deposit, couldn't identify the culprit: https://tinystash.undef.im/il/2QpKK6BDiUkgcMewPmmXPCyrqKTSJPRX5JCU8JAGnECakmaiHqNgDTtoBdP7huAKvJCRL4934NokVsvwES6QBezF.jpg
i wonder if it makes sense to dig any further or if i should write it off and buy a brand new one